1223.33% is the change from 30 to 397
Calculation steps:
[( 397 - 30 ) ÷ 30] x 100 = 1223.33%
Formula
Percentage change = [(397 - 30) / 30] x 100
Subtract the new number by the original number
397 - 30 = 367
367 ÷ 30 = 12.233333333333333
12.233333333333333 x 100 = 1223.33%